Electro-polarized relay



March 13, 1934o C. J. mom-' 2 AL ELECTRO-POLRIZED RELAY Filed. Dec. 5P 1933.

ATTOR N EVS Patented Mar. 13, 1934 1.951.321 ELEc'rno-Pommznn RELAY Clarence J. Don', Mount Vernon, and Harold F. May, Valley Stream, N. Y., signora to The Tcleregister Corporation, New York. N. Y., a corporation of Delaware Application December 5, 1931, Serial No. 579,142 2 Chinn. (Cl. 175-320) 'Ihis invention relates to improvements in electro-polarized relays.

Among the objects of this invention is the provision of an armature circuit controlled coil for causing the amature of a polarized relay to move into its normal circuit opening position immediately after the termination of the pulse which causes the relay to attract its armature. Other objects of the invention will appear from the following description taken in connection with the drawing which illustrates one form of our invention applied to a known form of relay, and in which Fig. 1 is a side view of a relay to which our invention is shown applied;

Fig. 2 is a longitudinal vertical axial section of the relay;

Fig. 3 is a bottom plan view of the relay;

Fig. 4 is a front end view of the relay looking toward the left in Fig. 1; and

Fig. 5 is a wiring diagram, showing a pair of relays.

The relay to which our invention has been shown as applied comprises a biasing coil A constantly energized, as indicated in Fig. 5, and a line coil B energized by positive and negative impulses over the line. When these relays are used in pairs, as indicated in Fig. 5, the line winding is such that a negative impulse on the line wire will cause the magnetic flux in the core D, Fig. 2, of relay Rl, Fig. 5, to ow in the same direction as that produced by the coil A, thus causing the armature E to be attracted toward the end of the core D. Movement of the armature in this direction will cause its arm F to close any number of contacts G which complete circuits for performing any desired operation. When the negative pulse is taken oif the line the coil A will function to hold the armature E in its attracted or circuit closing position, which is maintained until a positive pulse is sent over the line wire which produces a magnetic flux in the core D in the opposite direction to that produced by the coil A which 45 ilows through a conductor H connected to the center of the core D by magnetic material and terminating in a pole I causing the armature E to be moved away from the core, thus opening the circuits which were closed by the contacts G. The armature E is pivoted on a frame K which is connected to the core to provide a return path for the magnetic flux. When the positive impulse ceases the coil A will function to hold the armature in its contact opening position.

In a like manner, a positive pulse over the coil B of the relay R2, Fig. 5, will cause the armature of this relay to be attracted toward the core to close the corresponding contacts G, and after the pulse ceases the coil A will function to hold this armature in its circuit closing position. A negative impulse over the line wire causes the coil B of relay R2 to set up magnetic forces winch are opposed to those produced by the coil A which through the conductor H and the pole I cause the armature E to move away from the core into contact opening position.

The construction of the mechanism so far described is well known. The function of the coil A is to hold the armature against the core D or pole I, depending upon the position it was moved into under the influence of the coil B when energized by a positive or negative pulse over the line wire. In a. construction of this character the coil A will hold the armature in either of its positions until a pulse of opposite polarity is transmitted over the line, and when the relays are used in pairs, as in Fig. 5, the armature of either one of the relays is in contact closing position while that of the other is in contact opening position.

In carrying out our invention in connection with the relay described the relay is equipped with a third coil C wound in such a manner as indicated in Fig. 5 to oppose the iiux produced by the coil B when the coil B assists the coil A to attract the armature. The circuit for the coil C is normally open but is closed by one of the pairs of contacts G as the armature E is attracted toward the core D.

The relays may be used in pairs as indicated in the wiring diagram in Fig. 5, in which they are designated R1 and R2. As a negative impulse over the coil B of relay R1 causes the armature E to be attracted to the core D it closes the 95 circuit for the coil C at one of the contacts G which sets up a magnetic ilux in the core D opposing and counterbalancing that produced by the negative impulse over the coil B. The armature will, however, be held in its attracted posi- 100 tion by the coil A. As the negative pulse is taken oiI the line the magnetic flux produced by the coils A and C will flow through the conductor H and pole I and attract the armature E to the pole I, thus opening the various circuits 105 made over the contacts G including the circuit made over the coil C. The coil A will now function to hold the armature E in its outward contact opening position. A positive pulse over the line wire will not change the condition of the no relay R1. Such positive pulse. however, will cause the relay R2 to attract its armature which will close a circuit over its coil C, the coil C and coil A cooperating upon termination of the positive pulse to move the armature outwardly and to open the circuits made over the contacts G, including that made over the coil C. The coil A will function to hold the armature in its outward contact opening position until the arrival of another positive pulse.

By means of the construction shown the armature will be attracted to the core D and held in Contact closing position for a time interval equal approximately to that of the length of the pulse causing such attraction, and will immediately after the termination of the pulse be attracted to the pole I and held in such contact opening position by the biasing coil A until another negative operating pulse causes said armature to be attracted.

The biasing coil as used in a relay of this type permits the operation of numerous contacts. However, relays of this type have not been selirestoring but required an impulse of current contrary to that which operated them, to restore them. Such relays when used as in Fig. 5 offered a combination of operations in which one relay always had to be operated.

The use of a restoring winding C permits both relays to remain in their non-operated positions when no current flows through the line windings. This might be accomplished through the use of a line current of double the flux producing strength of that of the restoring winding and in that case it would be unnecessary to close the restoring winding through a contact. However, the use of the contact permits the use of a line current equal in flux producing strength to the restoring winding current which affords economies in power and line wires.

While we have shown the invention applied to a particular type of relay it is to be understood that this has been done merely for purposes of disclosure, and that it is to be understood that words of description imported into the claims from the specification are to be considered as such rather than words of limitation, and that the claims are to be accorded a scope permitted by the prior art.

What we claim is:

1. In an electro-polarized relay including a core, an armature, a plurality of contacts adapted to be closed by said armature, a biasing coil, a line coil cooperating with said biasing coil under control of a pulse of one polarity to move said armature into contact closing position, and a third coil energized over a circuit closed by one of said contacts and wound to oppose the action of said line coil and upon termination of said pulse to cooperate with said biasing coil to move the armature into contact opening position.

2. The combination of a pair of relays each provided with a core, a normally energized biasing winding, a line winding, a third winding, an armature. and a pair of contacts closed by the attraction of said armature to close a circuit over said third winding, the line windings of the respective relays being opposite and connected in series in the operating line, the line winding of each relay cooperating with its associated biasing winding to move the relay armature into contact closing position upon energization of the line winding by a pulse of proper polarity, said third winding of each relay cooperating with the biasing winding of said relay to move the armature of the relay into contact opening position upon termination of the pulse on the line winding which caused said armature to move into contact closing position.

CLARENCE J. DORR. HAROLD F. MAY. 

